Waveform is similar to that produced by an inductive input low pass filter with all but the first section inoperative when driven by a square wave input.
Bruce On Saturday, January 30, 2016 09:33:45 AM Bob Camp wrote: > Hi > > Unless it’s a really weird termination impedance, it’s broke. The SMA is a > pretty good indication that it *should* work into a 50 ohm load. > > The only other possibility is that your probe is taking the load far enough > off of 50 ohms to mis-tune the output filter. I’d set the scope to 50 ohm > input and cabe the output directly to it. If that’s not practical, put a 6 > db 50 ohm pad on the output of the oscillator and see what it looks like > after that. > > Bob > > > On Jan 29, 2016, at 10:19 PM, Logan Cummings <logan.cummi...@gmail.com> > > wrote: > > > > Hi All, > > > > Curious what could give this waveform (attached) - I presume this is > > > > not correct output for this oscillator (surplus/salvage from Harris > > Constellation receiver). > > > > Frequency looks OK with +2V EFC but output looks like neither sine nor > > > > any CMOS I've seen into 10Mohm (first capture, scope probe alone) or 50ohm > > (50ohm term at SMA connector, probed by same scope probe) . > > > > What gives? If I open up the can, what am I looking to possibly > > > > replace/eliminate? How to open it? It's soldered shut (2x2in case). > > > > I need a good low-noise 100MHz sine wave for my application so I'm > > > > tempted to open this guy up and replace the output circuitry with > > something > > more suitable. > > > > Thanks in advance for any pointers/info on these units! > > > > -Logan > > <tek00000.png><tek00001.png>______________________________________________ > > _ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the > > instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the > instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.